Telegraph-repeater.



No. 858,216. PATENTED JUNE 25, 1907.'

W. ROGERS. TEEEGRAPE REPEATER APPLIOATIN FILED DEO. 13. 1904.

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IVORTII ROGERS, OF ST. LOUIS, MISSOURI.

TELEGRAPH-REPEATER.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed December 13,1904. Serial No. 236,767.

To all whom, it may concern:

Be it known that I, WORTH ROGERS, a citizen of the United States, and a resident of St. Louis, Missouri, have invented certain new and useful Improvements in Telegraph- Repeaters, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying'drawings, forming a part hereof.

My invention relates to improvements in automatic telegraph repeaters; and consists of the novel features herein shown, described and claimed.

My improvement in telegraph repeaters is designed to correct the following described faults, common to allrepeaters in which the transmitter is controlled by the making and breaking of a local circuit at the contact point on the armature of a relay in a main line and the stop against which said armature rests, when the relay is magnetized and the armature attracted.

In a repeater as above described, any variation in the strength of the current flowing in the relay is more or less reproduced in the local circuit controlling the transmitter, due to the fact that if the current in the magnet is not strong enough to attract and hold the armature firmly against the front stop, an imperfect contact is made, and the full strength of the local current does not iow through the magnets of the transmitter. Thelesultant signals are what is known as Illig .b'

In my improved method of controlling the motion of the armature of the transmitter and causing it to move in unison with the armature of a relay in a main line and to thereby reproduce signals made by the vibration or movement of the armature lever and causing it to transmit these signals into another normally closed separate circuit by opening and closing said separate circuit at a point of contact on the armature of said transmitter, a current from a local battery is caused to flow normally through the magnets of the transmitter and said transmitter is normally closed; the opening of the said transmitter in unison with the armature of the relay being accomplished by shunting the local current around the transmitter magnets through a short circuit completed by the contact of the armature of the relay with the back stop of the relay, and the closing of the transmitter armature simultaneously with the armature of the main line relay being accomplished by the interruption of this shunt circuit at the back contact of the relay armature, restoring the local current to magnets of transmitter and causing armature of same to close. Thus the downward, or closing stroke, of the transmitter is made with the full strength of the local battery, it will be seen, regardless of the strength of the current flowing in the main line relay.

In a repeater as first described, the signal transmitted by the operator when he closes his key is shortened (in the transmitter), by the time required for the relay armature to travel from the back to the front stop, as the magnet of the transmitter is not excited until contact is made by the armature with the front contact. In my improved method of using a normally closed local circuit and shunting this circuit around the transmitter magnets to open said transmitter armature, the magnets of the transmitter are excited and the transmitter armature begins to move practically at the same instant as the relay armature. This allows of the shortening of the initial signals sent into the main-line, and consequently the speed of signaling is increased. This increase of speed is very marked on long circuits where the distant magnets tend to magnetize slowly, owing to mperfect insulation and static capacity of In the drawings: the figure is a diagrammatic view illustrating an automatic telegraphrepeater system embodying the principles of my ivention and showing the theoretical connections with all the instruments in their normal position and all the keys closed.

Referring to Figure l I will now describe the operation described above, using transmitter magnet 18, relay 15, battery 20, wire 2.2, 28, and assuming that wires 35 and 38 are one continuous wire. When the relay is closed. as shown in the figure, the local battery 2O flows through wire 19, transmitter magnet 18, wire 22 and coil 21. Magnet 18 is thus magnetized and attracts and closes armature 6; upon relay l5 being demagnetized, armature 37 is drawn back by its retractile spring, and makes contact with stop 29. This contact completes circuit 35-38, 28, and provides a `short circuit for battery 20, diverting said current from magnet 18, which demagnetizes and lets armature 6 open. It is seen that armature 6 closes simultaneously with armature 37, and opens after armature 37 has IOO IOS

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reached the back stop when relay 15 demagnetizes and releases it. This, as above stated and explained, is an advantage, and increases the speed of signaling.

I will now describe in detail the operation of my repeater in combination with the foregoing method. Referring to the drawings in detail the table 1 may represent the Kansas City station, and the circle 2 may represent the Chicago station, and the circle 3 may represent the Denver station. The eastern circuit 4 runs from Chicago to the post 5 of the transmitter magnet 18 and when the transmitter is closed the circuit passes over the line 7 to the relay 8 and then to the battery 9 and to the ground 10. The Denver circuit passes over the line 11 to the post 12 of the transmitter magnet 23 and when the transmitter is closed it passes over the line 14 to the relay 15 to the battery 16 and to the ground 17. The problem is to connect the Chicago circuit to the Denver circuit for automatic repeating. The transmitter magnet 18 is incorporated into the circuit ruiming from the magnet over the wire 19 through the battery 20 through the coil 21 and over the wire 22 back to the magnet. The magnet 23 of the transmitter 13 is incorporated into the circuit running over the wire 24 to the batterv 25 through the coil 26 and over the wire 27 back to the magnet. A wire 28 is connected to the wire 22, and to the post 29 of the relay'15. A Wire 30 is connected to the wire 24 and to the post- 31 of the relay 8. A wire 32 leads from the post 33 of the transmitter magnet 18 to the armature 34 of the relay 8. A wire 35 leads from the post 36 of the transmitter magnet 23 to the armature 37 of the relay 15. A wire 38 leads from the wire 19 to the armature lever 39 of the transmitter magnet 23. A wire 40 leads from the wire 27 to the armature lever 41. The opening of a key on the line 4 will cause the relay 8 to release its armature, and short circuit the local battery 25 through. the points 31 and 33, allowing the lever of the transmitter magnet 23 to open, thereby opening the western line 11 at the tongue 12. In the mean time the short circuit by the way of the points 29 and 36 has been closed at the point 29 the opening of the western line 11 and the consequent releasing of the armature to the relay 15, but not until it has been broken at the point 36, therefore the short route for the battery 2O remains broken and the armature 6 remains closed. hen the key upon the line 4 is closed the armature of the relay 8 is pulled away from the point 31 to close,

the western line 1 1 being thereby closed at the tongue 12, the armature of the relay 15 is pulled away from the point 29 breaking the short route of the battery 2O an instant before or at the same instant it is closed at the point 36. The armature 6 remains closed and preserves the continuity of the eastern line 4 through the tongue 5 during the entire operation. It is obvious the operation just described will be reversed when repeating from the western line 11 to the eastern line 4. Suppose that an eastern key is open, the armature 6 closed the transmitter magnet 23 open, the circuit at the posts 29 and 31 closed and the west key is then opened. The west circuit being already open at the tongue 12 the transmitter magnet remains closed until the eastern circuit closes the key. When the transmitter magnet 23 closes, the distant key of the western line 11 being open, when the point at the tongue 12 closes, thearmature of the relay 15 is not drawn away from the point 29 and the short route of the battery 2O is completed at the point 36, allowing the armature 6 to open and break the eastern line at the tongue 5. It is obvious that the transmitter magnet 23 remains closed as the short circiut for the battery 25 is opened at the point 33. The coils 21. and 26 contain just enough resistance to prevent burning out the fuse when the batteries 20 and 25 are short circuited and these coils are not neces sary when the system is arranged for gravity batteries.

I claim:

The improved method of preserving at the repeating station, continuity of the main line from which the signals are being transmitted, which consists in keeping closed the transmitter controlled by the main line being re peated into, by opening at the front contact point of the repeating transmitter controllinU the line being repeated into the shunt aroun the magnet of the transmitter controlled by the main line being repeated into before said shunt can be closed by the opening of the armature of the relay of the main line being repeated into, and thereby preventing the local battery of the second transmitter from being shunted around the coils of the second trans# mitter at any time.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses. i

WORTH ROGERS. l/Vitnesses:

ALFRED A. ErcKs, M. SOHULZE.

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